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a) 88 = 2 x 22/7 x r
88 = 44/7 x r
r = 88 x 7/44
r =14cm
b) 2 x 22/7 x r = 220
44/7 x r = 220
r = 220 x 7/44
r =35 cm
88 = 2 22/7 . r
88 = 44/7 . r
r = 88 : 44/7
r = 88 x 7/44
r = 14 cm
b. K = 2πr
220 = 2 . 22/7 . r
220 = 44/7 . r
r = 220 : 44/7
r = 220 x 7/44
r = 35 cm
Itu jawabannya.